Upgrading node and pm2 using nvm

node_pm2_update.md

Update node using nvm

nvm install 6.3
nvm alias default 6.3
nvm use 6.3

Install and Update pm2

npm install pm2@latest -g ; pm2 update
sudo update-rc.d -f pm2-init.sh remove [--force]
pm2 startup ubuntu

To switch any saved processes to use new node version

pm2 restart all